Grand Metropolitan plc is a former United Kingdom-based company operating hotels, holiday centres, entertainment centres, public houses and casinos. The company was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index until it merged with Guinness plc to form Diageo in 1997.

The business was incorporated in 1934 as a hotel business called MRMA Ltd and was first listed on the London Stock Exchange in 1961. It changed its name to Grand Metropolitan Hotels Ltd in 1962.

It diversified into catering acquiring Bateman Catering in 1967 and then Midland Catering in 1968. It then bought Express Dairies in 1969 and Berni Inns and Mecca in 1970.

Next came its move into brewing in 1972 as it bought Trueman, Hanbury & Buxton and Watney Mann including the latter's subsidiary International Distillers & Vintners (which owned the Smirnoff vodka, J&B whisky, Bailey's Irish Cream, Gilbey's gin, Piat wine and Croft sherry and port brands). It changed its name to Grand Metropolitan in 1973.